Mixing machine



May 4 1926.

P. o. DIEDERICHS HIKING MACHINE Filed Jan. 5 1925 V 1732222222224- R142OwDL ed'eric b4.

2 141 7391 0, v oum.

Patented May 4, 1926.-

- UNITED STATES PAUL o. DIEDERICHS, or cnroaeo', ILLINOIS, ASSIGNOR T0AMERICAN OVEN & ivra- PATENT. .OFFICE.

CHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MIXING MACHINE.

Application filed. January To all whom it may concern:

Be it known that I, PAUL O. DIEDERIOHS, a citizen of the United States,andaresident of Chicago, in the county of Cook and State of Illinois,have invented certain new and useful Improvements in Mixing Machines, ofwhich I declare the following to be a full, clear, and exactdescription, reference being had to the accompanying drawing, forming apart of this specification.

The present invention is particularly applicable to'that class ofmachines for mixing and kneading dough in which the mix: ing chamber isprovided with a stationary cover, beneath which such chamber is revolvedor tilted to discharge its contents, and permit the chamber to becleaned. The invention consists inthe novel construction of cover hereindescribed, illustrated in the accompanying drawing, and particularlypointed out in the claims at the end of the specification. p

Fig. 1 is a view in central vertical section, through a dough mixingmachine embodying my invention. I

Fig. 2 is a plan View, upon a reduced scale, of the cover and means forsupporting the same.

Fig. 3 isa view in central vertical section through the top of themixing chamber,'and through a cover embodying a modified form of myinvention. 1

In a mixing machine of the character to which my invention applies, themixing chamber is provided withone or more beater arms, adaptedtorevolve within the chamher. In practice, it is found, as for examplein the mixing of dough, that when the ingredients of the batch areplaced within the mixing chamber, and the beaterarms are'revolved,liquid will be thrown against the underside of the cover; and thisliquid will flow down the underside of the cover and more or less of itis apt to leak through the joint between the cover and the front andrear wallsof the mixing chamber. The pri mary object of my invention isto prevent suchleakage and insure that any liquid thrown against theunderside of the cover shall drip backinto the body of the mixingchamber. I

Referring to the accompanying drawing Ardesignates the mixing chamber,which is 5, 1925. Serial 110. 483.

of a type commonly used dough mixing machines. This mlxing chamber A,vis

- mounted to revolve about a central shaft 13,

or trunn'ions, and the upper edges of the end walls a of the m1x1ngchamber are curved ,1

upon an arc concentric with the shaft or axis B,'so as to enable thechamber A to be tilted from the position shown in full lines to theposltlon shown by dotted lines in l of the drawing. The front and rearwalls a and a of the mixing chamber are shown as. with dough reinforcedby bars a as is usual m1x1ng chambers of th1s character. I

Above the mlxmg chamber A 1s mounted the cover C that is curved toconform to the curvature of the end walls a'of the mixing chamber- Thiscover C is stationarily supported relative to the mixing chamber A, 1n

any of the well knownways; As shown, the v In the form :of the inventionillustrated in Figs. 1 and 2 of the'drawings, the cover .0 is formed ofa main sheet metal plate 0,

having the usual central opening 0 therein,

through which the flour to-bemixed will be delivered to the mixingchamber. To; the front edge of the plate 0 of the cover isse:

cured, as by welding or riveting, a supplemental plate E, the innerportion ofthis plate E being slightly offset to enable it ,to 1 overlapthe front edge of the plate a. By

this arrangement the front edge ofthe plate 0 constitutes'a dripshoulder 0 that is within the lineof the front wall a of the mixingchamber, and from. this drip shoulder liquid thrown on the under side ofthecover will drip backinto the mixing chamber. As

shown, the supplemental plate E has hinged thereto as at e the usualsheet metal flap or 'plate E.

To the rear edge of the cover C is connected a supplemental plate E andprefer ablyv this plate is united by hinges e to the plate C, so as toenable the'supplemental' plate E to be lifted, as by its handle 6 inorder topermit certain ingredients, such as additional yeast, water orother material, to be placed in the mixing chamber. Inasmuch therear'edge portion of the cover vG, the

*as the supplemental plate E extends over der 0 extending longitudinallyfrom 'end to end of the cover, and from this shoulder a liquid thrownupon the under side of the cover will drip down into the mixing chamber.Preferably, the rear drip shoulder a of the cover C is arranged at agreater distance from the rear wall a of the mixing chamber than thedistance between the front shoulder a and the front wall a of the mixingchamber, the purpose of this construction being to afford ample spacewhen the supplemental plate E is lifted to permit materials to be placedin the mixing chamber.

In dough mixing machines of the character to which my invention relates,the greatest danger of leakage is above the rear wall a of the mixingchamber, as the revoluble beater arms tend to throw the liquid againstthe rear part of the cover. I therefore prefer to provide thesupplemental plate E adjacent the top of the rear wall a of the mixingchamber with a depending rib or baffle 76 that will come in closeproximity to the top edge of the rear wall-a of the mixing chamber whenthe latter is in position for use, this rib or wall 6 extending betweenthe end walls of the mixing chamber. Inasmuch as this rib or baffle 6 asshown in Fig. 1, depends below the top edge of the wall a, the bottomportion of this rib or bafile e is preferably rounded or inclined, sothat as the mixing chamber is tilted 'forward to discharge its contents,the top edge of the back wall a will contact with the inclined orrounded surface of the rib or baffle e and will slightly lift the hingedsupplemental plate E From the foregoing description it will be seen thatwhen the mixing chamber is in position for use, as illustrated in fulllines in Fig. 1 of the drawing, the cover C serves to tightly close themixing chamber and the drip shoulders c and c at the front and rear ofthe cover and the rib or baffie e (if the latter be used) insure thatany liquid thrown against the under side of the cover shall drip backinto the mixing chamber and not pass over the front and rear wallsthereof. Inasmuch as the under side of the curved cover G which overlapsthe curved under walls of the mixing chamber has no obstructions, itwill be seen that the mixing chamber can be readily turned to dischargeits contents from the position shown by full lines in Fig. l to theposition shown by dotted lines in such figure of the drawing; and whenthe rib or baffle, serving as a drip shoulder, is employed on the hingedsupplemental plate E this will not interfere with the tilting movementof the mixing chamber.

In the modified form of the invention illustrated in Fig. 8 of thedrawing, the cover C is shown as having its front portion made from asingle metal plate near the front edge of which is formed a channel athat extends lengthwise of the cover from approximately end to endthereof. The channel 0 thus formed by bumping out or offsetting aportion of the cover 0 adjacent its front edge, affords a drip shoulder0 that extends fro-m end to end of the mixing chamber and insures thatliquid thrown against the under side of the cover shall drip back intothe mixing chamber. In the form of the invention illustrated in Fig. 3,the supplemental plate E is similar in construction to the supplementalplate E hereinbefore described and in like manner is offset to overlapthe rear edge portion of the cover C and is hinged as at adjacent therear edge portion of the cover. In this form of the invention, however,the under side of the supplemental plate E is shown as provided with arib or bafile e that will extend from approximately end to end of thesupplemental plate E and will afford a supplemental drip shouldertoenable any liquid thrown against the supplemental plate E to drip backinto the mixing chamber. This rib or battle 6 is shown in Fig. 3 as notdepending below the curved upper edges and the end walls a of the mixingchamber. Preferably, the channel 0 will terminate at a slight distanceaway from the ends of the cover so that the danger of any materialescaping from the ends'of the channel will be avoided. It will beunderstood, however, that inasmuch as the cover is formed ofcomparatively thin sheet metal, the channel 0 might extend from end toend of the cover; so, also, it will be understood that the extreme endsof the supplemental plates E and E may be pressed down or shaped to fitupon the curved upper edges of the end walls of the mixing chamber toprevent any escape of material at such points. 7

It will be understood that the details of construction above set out maybe varied without departing from the spirit of the invention and thatfeatures of the'invention may be employed without its adoption as anentirety.

Having thus I claim as new and desire to secure by Letters Patent is:

1. A mixing machine comprising a mixdescribed my invention, whatadjacent its rear edge and over said chamber.

3. A mixing machine comprising a mixin chamber pivoted to tiltabout itsaxis and having its end walls curved upon an arc substantiallyconcentric with said axis and a fixed cover the under surface whereof iscurved to correspond with the curved end walls of said chamber, theunder surface of said cover being formed with a drip shoulder adjacentone of its edges and extending lengthwise of the cover. I 4. A mixingmachine comprising a mixing chamber having end walls with curved upperedges and a curved cover, one edge of said curved cover being providedwith a movable supplemental plate extending lengthwise of the cover,said coverhaving a drip shoulder extending beneath said supplementalplate and lengthwise from end to end thereof.

5. A mixing machine comprising a mixing chamber having end walls withcurved upper edges and a curved cover, one edge of said curved coverhaving hinged thereto a supplemental plate extending lengthwise of thecover, said cover having a drip shoulder extending beneath saidsupplemental plate and lengthwise from end to end thereof.

6. A mixing machine comprising a mixing chamber, a cover therefor therear edge of said cover terminating inside the wall of said mixingchamber and forming a drip shoulder extending from end to end of thecover, and a supplemental plate extending over the edge of said coverand hinged thereto. v

7. A mixing machine comprising a mixing chamber having end walls withcurved upper edges, and a curved cover adapted to close upon the curvededges of the mixing chamber the end surface of said cover being providedadJacentitS edge and above the interior of the mixing chamber with a ribor baffle extending lengthwise thereof.

8. A mixing machine comprisinga mixing chamber, a cover therefor, and asupplemental plate extending lengthwise of said cover and hingedthereto, said supplemental plate having upon its under surface .a rib orbaffle extending lengthwise of said plate and in proximity to the backwall of the mixing chamber.

9. A mixing machine compr1s1ng a mixlng chamber p1votall mounted to betlltable' about its and having its end walls,

